FORMULAS 289 



Weight of Alimentary Tract on Body Weight (Hatai, '13) 



Weight of alimentary tract {sexes combined) = 



0.0245 Bd. wt. + 4.720 log (Bd. wt. + 7) - 5.753 (23) 

 Formula (23) was used for table 146. 



Weight of the Stomach on Body Weight (Hatai '18) 



Weight of stomach (sexes combined) = 



0.00375 Bd. wt. + 0.00016666 Bd. ivt.^ + 0.0073 



4 < Bd. u't. < 20 (24) 

 0.00204 Bd. wt. + 0.631 log Bd. wt. - 0.7130 



Bd. wt. ^ 20 (24 a) 



Weight of the Pancreas on Body Weight (Hatai, '18) 



In the pancreas a sex difference is distinctly shown. The 

 pancreas in the female is heavier than in the male; consequently 

 the growth of the pancreas in weight is treated separately accord- 

 ing to sex and is represented by the following formulas (25), (25 a). 



Some later observations by Hammett ('23) indicate that this 

 sex relation may be reversed in certain strains. 



It is evident from the limits stated that the formulas do not 

 apply to the body weight which is less than 10 grams, and further- 

 more that the pancreas of the female between 10 and 20 grams in 

 body weight is represented by the formula employed for the 

 male rats. 



Weight of the Pancreas on Body Weight (Hatai, 'IS) 



Male = 0.048 + 0.0036 (Bd. wt. - 9) + 0.09 log (Bd. ivt. - 9) 



Bd. wt. -^ 10 (25) 



Female -= 10 < Bd. wt. < 20 Formula (25) is used. 

 Female = 0.00339 Bd. wt. + 0.248 log Bd. ivt. - 0.2091 



Bd. wt. ^ 20 (25 a) 



